Ethelbert, per Jeopardy! final answer 1/18/07.
On Jan. 18, 2007, the final question on the game show Jeopardy was...
A: The middle initial E. of this character introduced in 1949 stands for Ethelbert.
Q: Who is Wile E. Coyote?
Ever wonder where the heck this "fact" came from? It wasn't from a cartoon or anything revealed by Chuck Jones later in life. No, it came from a single 1973 Looney Tunes comic book story.
I really doubt this was ever intended to be the character's "official" middle name but thanks to Jeopardy, I am sure this "fact" will be popping up for years to come.
http://toolooney.blogspot.com/2007/02/dirt-on-ethelbert.html
We all love Wile E. Coyote, the long-suffering Road Runner chaser. But, uh, what does the "E" stand for?
I guess I don't know. I mean, none of the cartoons directed by Charles "Chuck" Jones and written by Michael Maltese ever said. Only a couple of them ever even said his name was Wile E. Coyote.
But it has just been brought to my attention that more than a thousand websites say the Coyote's middle name is Ethelbert. The source for this is a 1973 story that appeared in the comic book, Beep Beep the Road Runner, published by Western Publishing Company under its Gold Key imprint.
In the story, which was called "The Greatest of E's," Wile E. Coyote realizes he doesn't know and gathers together some of his relatives to answer the question. One is an uncle named Kraft E. Coyote who informs him and the world that the "E" stands for Ethelbert. That is, as far as I know, the only piece of fiction licensed or otherwise blessed by the Warner Brothers company that ever said such a thing.
http://www.newsfromme.com/2015/01/09/name-game-3/